# Helical-gear geometry and forces
# Scope: Normal-to-transverse module conversion for a helical gear.
# Status: illustrative worked example; engineering review pending.
# Inputs are example values. Checks are editable example requirements, not standards.

normalModule = 2 mm
helix = 20 deg
teeth = 30

transverseModule := normalModule/cos(helix) [mm]
pitch := transverseModule*teeth [mm]

check pitch diameter budget: pitch <= 70 mm

scenario alternative: normalModule = 1.6 mm


# Diagram dimensions are illustrative; teeth are schematic, not manufacturing profiles.
check whole teeth: abs(teeth-round(teeth)) <= 0
check positive teeth: teeth >= 3